Co-Investment Due Diligence: How LPs Approach Direct Deals

Co investment due diligence is when a limited partner independently evaluates a specific deal led by a private equity sponsor. You treat each co investment as a direct investment, but with tighter timelines and less information than a blind-pool fund commitment. Co investors usually step in later in the deal timeline, making fast analysis critical.

Executive summary: how LPs should approach co-investment due diligence

The work splits into three parallel tracks: GP and sponsor diligence, company-level due diligence, and structural review of the co investment vehicle. The due diligence process assesses investment viability and risks across all three. A co investment due diligence process requires a comprehensive approach to evaluate both the target company and lead sponsor.

Limited partners who don't have in-house direct deal teams use external experts and integrated platforms like FieldSignal to fill information gaps quickly and safely. This matters because co investment windows are typically 1 to 4 weeks from teaser to investment committee decision.

This article addresses four recurring risks: overreliance on sponsor materials, overconcentration in a single investment, weak downside cases in financial modeling, and unclear co investor rights in the SPV documentation. If you're a PE or VC associate, corporate M&A analyst, or boutique consultant evaluating co investment opportunities, this is your working framework.

What a co-investment is (and how it differs from a direct investment)

Co investments are minority investments made directly into portfolio companies. They operate alongside but separate from the main private equity fund. Co investment capital is never commingled with the main fund's assets. Co investment vehicles are governed by separate agreements that define economics, governance, and exit mechanics.

In a pure direct investment, the LP sources, diligences, and negotiates the deal without relying on a private equity sponsor or fund managers. Co investing preserves the GP's role as lead while giving select investors the ability to participate in specific investments.

Key structural points:

• SPVs are commonly used for co investment structures. The median size of co investment SPVs reached $22.6 million in 2023.

• Club deals involve multiple co investors alongside the GP, sometimes with varying terms.

• Growth equity co investments typically involve minority stakes in late-stage private companies.

• Co investments allow LPs to select specific investment deals rather than relying on blind-pool allocation.

• While co investments often sit in a private equity fund context, the same mechanics appear in growth equity, private credit, real estate, and infrastructure as alternative investments.

Why LPs want co-investments with private equity and growth equity sponsors

The strategic advantages of co investing come down to economics, exposure, and access.

• Fee and carry benefits. Co investments can reduce management fees for LPs. Management fees are often waived, and carried interest may be waived for co investors. Some co investments are structured on a "no fee, no carry" basis. Only 44% of SPVs charge management fees. This directly improves net returns versus a primary fund commitment with standard transaction fees.

• Targeted exposure. Co investments provide LPs with targeted exposure to specific companies. Instead of relying entirely on a blind-pool investment strategy, you can tilt toward favored sectors like software, healthcare, or energy transition.

• Strategic access. Co investments provide LPs with enhanced due diligence access to GP materials, deal memos, and sponsor underwriting. This deepens your relationship with top-tier fund managers and improves your ability to evaluate future investment opportunities.

• Trade-offs. You take on concentration risk in a single company. Each deal requires internal bandwidth to assess. You also face incremental legal and tax complexity, subscription agreement reviews, and potential conflicts.

Core due diligence framework for co-investments

Co investors must independently verify all financials, operations, and legal risks before deploying capital. Don't treat the GP's memo as your memo.

Break your investment process into three parallel tracks:

1. GP and sponsor assessment

2. Company-level due diligence on the target company

3. Co investment structure and terms review

Typical timing: co investor windows run 1 to 4 weeks from teaser to investment committee. Primary research with experts, customers, and ex-employees through FieldSignal or similar expert networks is a core information source in these compressed timeframes.

1. Diligence on the GP and fund-level context

Evaluate the lead sponsor's track record and co investment alignment to ensure interests are protected. Validating the lead sponsor helps protect minority rights and governance terms.

• Examine the deal partner's prior deals with similar size, sector, and value-creation plan. Focus on realized vs unrealized MOIC, DPI, and gross-to-net spread across the last two fund vintages.

• Understand the PE fund's portfolio concentration, remaining reserves, and how this co investment fits the GP's overall investment strategy. Check if general partners are near fund concentration limits.

• Independent reference checks verify the sponsor's claims and management's competence. For emerging managers raising Fund I or II, external expert calls are essential.

• Only about 5% of reviewed funds pass the due diligence process. That number tells you the bar is high and should be.

2. Company-level co-investment due diligence

Financial work. Financial due diligence verifies accuracy of financial statements. Analyzing financials includes reviewing historical financial statements and verifying revenue streams. Focus on quality of earnings, revenue recognition policies, customer concentration, and cash conversion. Stress test the model under flat and declining growth scenarios.

Market work. Commercial due diligence analyzes industry and competitive pressures. Size the market through at least 2030 using third-party sources. Validate growth assumptions through external interviews where possible. Screen for regulatory overhang, technology disruption, and policy risk.

Operational work. Operational due diligence evaluates business operations and management practices. Assessment of operational scalability involves evaluating the target company's business model and technology readiness. Check management depth, key-person risk, supplier dependency, and whether the portfolio company can scale at current margins.

ESG. Screening for ESG factors helps prevent hidden long-term risks in investments.

Deal type adaptation. Buyouts demand focus on restructuring, cost synergies, and debt capacity. Growth equity deals need emphasis on margin expansion and product-market fit. Minority recapitalizations require close attention to alignment with existing management and exit rights.

3. Structure, rights, and alignment in the co investment vehicle

Co investment agreements should clearly define expense responsibilities, including who bears broken-deal costs, legal fees, and audit expenses. Conducting legal and compliance checks includes scrutinizing material contracts and regulatory adherence.

• Economics. Review the fee schedule, carried interest structure, and expense allocation. Compare these to the main fund LPA to spot potential conflicts of interest or preferential treatment.

• Governance. Assess board seats, consent rights, and information rights. Know what you can and can't block in future financings or exits. A side letter may grant additional protections.

• Transfer provisions. Evaluate tag-along, drag-along, and pre-emptive rights. Restrictions on selling or transferring your co investment interest directly affect liquidity and informed decisions at exit.

• Exit alignment. Aligning exit strategies involves collaborating with the lead sponsor on realistic timelines and events. Legal due diligence assesses contracts and compliance with laws governing the vehicle.

• Co investments require careful management of conflicts of interest between the SPV and the main fund.

Key risk areas unique to co-investments

1. Overconcentration. A single investment failure in one specific company hurts far more than diversification across a fund. Set position limits by company, sector, and sponsor across your multi-year private equity program.

2. Information asymmetry. The GP has day-to-day board exposure and monitoring. You depend on quarterly reporting and ad hoc updates to make investment decisions.

3. Timing pressure. Short co investment windows push you toward overreliance on sponsor materials without rigorous due diligence.

4. Conflicts of interest. The main fund may be near its concentration limits or may need co investment capital to complete the deal. Watch for adverse selection where GPs offer deals they're less confident about.

5. Legal and operational complexity. Managing multiple SPVs creates separate tax filings, audit requirements, and expenses. Setup costs run $15,000 to $75,000 per SPV depending on asset type and jurisdiction.

6. Exit risk. Poorly negotiated drag-along or tag-along provisions can lock you into the GP's decision making timeline.

How LPs actually source information for co-investment due diligence

• Sponsor materials. Investment committee memos, vendor due diligence, commercial DD, technical DD, and financial models. Review these critically. Validate assumptions and look for overly optimistic base cases.

• Internal resources. Portfolio ops teams, sector specialists, and prior work your firm has done on the GP's fund or industry. Use internal benchmark datasets to stress test the GP's growth forecasts.

• External sources. Expert network interviews, customer and supplier surveys, and targeted panel calls arranged within days. These fill knowledge gaps that sponsor materials won't cover.

• FieldSignal is a pay-per-use, transparent alternative to GLG or AlphaSights for investors that don't have big retainer budgets. No annual commitment, no minimum spend, and pass-through expert honoraria.

Using expert networks to validate sponsor theses

LPs rely on expert perspectives to test the GP's underwriting on a specific co investment. Here's a simple interview plan:

1. 2 to 3 current or former customers of the target company

2. 1 to 2 ex-employees or competitors

3. 1 former senior executive from a comparable company in the market

Ask about pricing power through 2026 to 2028, churn drivers, vendor switching behavior, and realistic margin expansion levers. FieldSignal runs sourcing, vetting, compliance checks, and call logistics, then delivers transcripts that plug directly into investment memos. When a co investment window is only 1 to 2 weeks, you can also commission short surveys or quick-turn market scans.

Process design: building a repeatable co-investment DD playbook

• Create standardized templates: screening memos for initial co investment opportunities, management call checklists, and final IC memo structures. Use uniform metrics across deals.

• Assign a single internal owner per co investment with clear handoffs across finance, tax, legal, and sector specialists. This prevents last-minute confusion and missed obligations.

• Set pre-agreed "no go" thresholds: maximum capital commitment, minimum EBITDA margin, red lines on governance rights. These speed decision making and kill bad deals early.

• Track outcomes of each co investment and back-test initial underwriting so your playbook improves across 2026 to 2030 vintages for enhanced returns and successful investment outcomes.

Working within tight co-investment timelines

Here's a default 10-day plan you can adapt:

Financial modeling and expert calls run in parallel to avoid bottlenecks. Pay-per-use research partners like FieldSignal allow you to spin up primary research for one specific co investment without an annual retainer. Save call transcripts, models, and memos centrally. You'll need them for audit, future continuation fund decisions, or secondary transactions.

How FieldSignal supports LPs on co-investment due diligence

FieldSignal connects you with former employees, customers, suppliers, and industry operators of the target company or direct competitors, usually within days. You get the expertise and access you need to assess a deal independently.

The model is pay-per-use. No annual retainer, no minimum commitment, and pass-through expert honoraria. This contrasts with opaque pricing at networks like GLG, AlphaSights, or Third Bridge, where you're often locked into six-figure annual contracts before you invest a dollar.

Compliance matters in this business. FieldSignal runs expert vetting, conflict checks, and provides clear guidelines so your co investment due diligence doesn't create legal exposure or security risks. Security verification and security service protocols protect both you and the experts.

Transcripts, recordings, and surveys from FieldSignal plug directly into your co investment memos, helping you independently validate or challenge the GP's thesis. That's how you build conviction on a deal, not by trusting someone else's memo.

Next steps

• Document your current co investment process. Identify where you rely too heavily on sponsor materials and where external expert input would raise conviction.

• Build a simple "co investment DD checklist" that includes a block for at least 2 to 3 third-party expert calls on each direct investment. Evaluate and request verification successful completion of each step.

• Define your no-go thresholds, assign ownership, and track wealth creation outcomes across vintages.

If you have an upcoming co investment or direct deal and need fast, compliant primary research, reach out.

See if FieldSignal fits your project → miles@fieldsignalhq.com